I think the big issue people have with them is that they're having some financial problems, and there's also something to do with having as much bandwidth coming in as you have going out, or something like that.
As long as your host is on top of his game and has a back up plan in case cogentco pulls an excite@home and cuts people off, its fine for now.
And its a fuck of a lot cheaper than anywhere else I've looked.
I figure worst case scenario is if cogentco goes under then my host has to plug his network into another provider and I'll pay the same for bandwidth as everybody else. But for now I'll save the $$$
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Did somebody say Free Content?